"use client";

import React, { useState } from "react";
import { useRouter } from "next/navigation";

const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;

const RegPage = () => {
  const router = useRouter();

  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [rememberMe, setRememberMe] = useState(false);
  const [checkboxError, setCheckboxError] = useState(false);

  const isEmailValid = emailRegex.test(email);
  const isFormValid = isEmailValid && password.length > 0;

  const handleSubmit = (e) => {
    e.preventDefault();

    if (!rememberMe) {
      setCheckboxError(true);
      return;
    }

    setCheckboxError(false);

    if (!isFormValid) return;

    console.log("Email:", email, "Password:", password, "Remember:", rememberMe);
    router.push("/regCode");
  };

  return (
    <div className="min-h-screen w-full bg-[#90D2F9] flex items-center justify-center px-4">
      <div className="w-full max-w-md bg-white/10 rounded-2xl p-6 sm:p-8 shadow-lg relative">
        {/* Красный баннер ошибки по чекбоксу */}
        {checkboxError && (
          <div
            className="absolute -top-10 left-0 w-full bg-red-500 text-white text-xs sm:text-sm font-montserrat px-3 py-2 rounded-t-2xl flex items-center justify-center shadow-md"
            role="alert"
          >
            Вы не согласны с условиями использования
          </div>
        )}

        {/* Кнопка Назад */}
        <div className="flex items-center justify-between mb-4">
          <button
            type="button"
            onClick={() => router.back()}
            className="text-[#ebebeb] text-sm font-montserrat hover:underline"
          >
            Назад
          </button>
          <span className="flex-1 text-center font-montserrat text-white font-extrabold text-2xl">
            Регистрация
          </span>
          {/* Пустой блок для выравнивания по центру заголовка */}
          <span className="w-[48px]" />
        </div>

        <form onSubmit={handleSubmit} className="mt-2 space-y-4">
          {/* Почта */}
          <div className="space-y-1">
            <label className="block font-montserrat font-extrabold text-xs text-white">
              Почта
            </label>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              className="w-full rounded-full bg-white px-4 py-2 text-sm font-montserrat text-black outline-none focus:ring-2 focus:ring-blue-200"
            />
            {!isEmailValid && email.length > 0 && (
              <p className="text-[11px] text-red-600 font-montserrat">
                Введите корректный email
              </p>
            )}
          </div>

          {/* Пароль */}
          <div className="space-y-1">
            <label className="block font-montserrat font-extrabold text-xs text-white">
              Пароль
            </label>
            <input
              type="password"
              value={password}
              onChange={(e) => setPassword(e.target.value)}
              className="w-full rounded-full bg-white px-4 py-2 text-sm font-montserrat text-black outline-none focus:ring-2 focus:ring-blue-200"
            />
          </div>

          {/* Чекбокс */}
          <div className="flex items-start space-x-2">
            <button
              type="button"
              onClick={() => {
                setRememberMe((prev) => !prev);
                if (!rememberMe) setCheckboxError(false);
              }}
              className={`w-5 h-5 rounded-full border border-white flex items-center justify-center ${rememberMe ? "bg-white" : "bg-transparent"
                }`}
            >
              {rememberMe && (
                <span className="h-2 w-2 rounded-full bg-[#90D2F9]" />
              )}
            </button>
            <p className="font-montserrat text-[10px] leading-[12px] text-white">
              Подтверждаю, что я прочитал условия использования данного приложения
            </p>
          </div>

          {/* Кнопка Войти */}
          <button
            type="submit"
            disabled={!isFormValid}
            className={`mt-4 w-full rounded-full py-2 text-center font-montserrat font-extrabold text-sm transition-colors
              ${isFormValid
                ? "bg-green-500 text-white hover:bg-green-600"
                : "bg-white text-[#C4C4C4] cursor-not-allowed"
              }`}
          >
            Регистрация
          </button>
        </form>
      </div>
    </div>
  );
};

export default RegPage;